Light source system employing wavelength conversion materials and color filters

ABSTRACT

Provided is a projection system, a light source system, and a light source assembly. The light source system ( 100 ) comprises an excitation light source ( 101 ), a wavelength conversion device ( 106 ), a color filtering device ( 107 ), a drive device ( 108 ), and a first optical assembly. The wavelength conversion device ( 106 ) comprises at least one wavelength conversion region. The optical filtering device ( 107 ) is fixed face-to-face with the wavelength conversion device ( 106 ), and comprises at least a first optical filtering region. The drive device ( 108 ) drives the wavelength conversion device ( 106 ) and the optical filtering device ( 107 ), allowing the wavelength conversion region and the first optical filtering region to act synchronously, and the wavelength conversion region is periodically set on the propagation path of the excitation light, thereby converting the excitation light wavelength into converted light. The first optical assembly allows the converted light to be incident on the first optical filtering region. The first optical filtering region filters the converted light, so as to enhance the color purity of the converted light. The light source system is simple in structure, easy to implement, and highly synchronous.

FIELD OF THE INVENTION

This invention relates to the field of light source used in illuminationand display, and in particular, it relates to projection system, lightsource system and light source assembly.

DESCRIPTION OF THE RELATED ART

Currently, projectors are widely used in various applications, includingplaying movies, meeting and public events, etc. Phosphor color wheelsare often used as the light source of projectors for providing a colorlight sequence. In such a device, different segments of the phosphorcolor wheel are alternately and periodically provided in the propagationpath of the excitation light, on which the phosphor material coated areexcited by the excitation light in order to generate color fluorescentlight. However, because the spectral range of the fluorescent lightgenerated by the phosphor material is wide, the color purity of thefluorescent light is poor, which result in an insufficient color gamutof the light source. In this case, color filters are needed to filterthe fluorescent light, so that the color purity of the fluorescent lightcan be improved. However, because the spectral ranges of differentcolored fluorescent light are partly overlapped, they cannot be filterusing a same color filter, so that different colored fluorescent lightneeds different color filter. In a conventional device, a color filterwheel composed of different color filters is provided in the entrance ofthe light homogenization rob, and a driving device of the color filterwheel and a driving device the phosphor color wheel are synchronized byelectronic circuits. The above method has the following disadvantages:the structure is complex, it is difficult to achieve, and thesynchronization effect is poor.

As the projector industry is increasingly competitive, manufacturershave to improve the quality of the projector to enhance theircompetitiveness. The inventors of the present invention in the processof actively seeking to improve the quality of the projector found that:in the prior art, the synchronization architecture of the phosphor colorwheel and the color filter wheel of the projector light source has thetechnical problem: the structure is complex, it is difficult to achieve,and the synchronization effect is poor.

So, a projection system, a light source system and the light sourcedevices are needed to solve the above technical problem existing in thesynchronization architecture of the phosphor color wheel and the colorfilter wheel of the projector light source in the prior art.

SUMMARY OF THE INVENTION

The present invention seeks to solve the problem by providing aprojection system, a light source system and light source assembly tosimplify the synchronization architecture of the wavelength conversiondevice and the color filtering device, and improve the synchronizationeffect.

To solve the above problem, the present invention adopts a technicalsolution: providing a light source system, which includes an excitationlight source, a wavelength conversion device, a color filter device, adriving device and a first optical assembly. The excitation light sourceis for generating an excitation light. The wavelength conversion deviceincludes at least one wavelength conversion area. The color filterdevice is fixed with respected to the wavelength conversion device, andincludes at least one color filter area. The driving device is fordriving the color filter device and the wavelength conversion device andmakes them move synchronously. The wavelength conversion areas areprovided in the propagation path of the excitation light periodically inorder to convert the excitation light into converted light. The firstoptical assembly is used to guide the converted light to the first colorfilter area, and the first color filter area filters the converted lightto improve its color purity.

In some embodiments, the wavelength conversion device and the colorfilter device are two ring structures fixed coaxially.

In some embodiments, the driving device is a rotation device with arotating shaft, and the two ring structures are coaxially fixed to therotating shaft.

In some embodiments, the wavelength conversion area and the first colorfilter area are located at 180-degree angle from each other with respectto a centre of the two ring structures. A light spot formed by theexcitation light on the wavelength conversion device and a light spotformed by the converted light on the color filter device after beingdirected by the first optical assembly are located at 180-degree anglefrom each other with respect to the center of the two ring structures.

In some embodiments, the wavelength conversion area and the first colorfilter area are located at 0-degree angle from each other with respectto a center of the two ring structures. A light spot formed by theexcitation light on the wavelength conversion device and a light spotformed by the converted light on the color filter device after beingdirected by the first optical assembly are located at 0-degree anglefrom each other with respect to the center of the two ring structures.

In some embodiments, the wavelength conversion device and the colorfilter device are spaced apart along an axial direction of the drivingdevice; the first optical assembly includes at least one lightcollecting device disposed between the wavelength conversion device andthe color filter device; and the light collecting device collects theconverted light so that an energy of the converted light incident on thecolor filter device with less than or equal to 60-degree incident anglesis more than 90% of a total energy of the converted light.

In some embodiments, the wavelength conversion area reflects theconverted light so that a direction of the converted light emitted fromthe wavelength conversion area is opposite to a direction of theexcitation light incident on the wavelength conversion area.

In some embodiments, the wavelength conversion area transmits theconverted light so that a direction of the converted light emitted fromthe wavelength conversion area is the same as a direction of theexcitation light incident on the wavelength conversion area.

In some embodiments, the first optical assembly includes at least onelight collecting device which collects the converted light so that anenergy of the converted light incident on the color filter device withless than or equal to 60-degree incident angles is more than 90% of atotal energy of the converted light.

In some embodiments, the first optical assembly includes at least onereflecting device which reflects the converted light to change apropagation direction of the converted light, and the reflecting deviceis a planar reflecting device or a semi-ellipsoidal or hemisphericalreflecting device with a reflecting surface facing inside.

In some embodiments, the planar reflecting device includes a dichroicmirror or a reflecting mirror.

In some embodiments, the semi-ellipsoidal or hemispherical reflectingdevice with the reflecting surface facing inside is provided with alight entrance port through which the excitation light is incident onthe wavelength conversion device.

In some embodiments, the wavelength conversion device further includes afirst light transmission area which is periodically disposed in thepropagation path of the excitation light under the driving of thedriving device and which transmits the excitation light.

In some embodiments, the system further includes a second opticalassembly which combines the excitation light transmitted by the firstlight transmission area and the converted light filtered by the firstcolor filter area.

In some embodiments, the color filter device includes a second lighttransmission area or a second color filter area, and the first opticalassembly guides the excitation light transmitted by the first lighttransmission area, along the same propagation path of the convertedlight, to the second light transmission area or the second color filterarea to be transmitted or filtered.

In some embodiments, the system further includes an illumination lightsource which generates an illumination light; the wavelength conversiondevice further includes a first light transmission area which isperiodically disposed in a propagation path of the illumination lightunder the driving of the driving device, the first light transmissionarea transmitting the illumination light; the color filter devicefurther includes a second light transmission area or a second colorfilter area; and the first optical assembly guides the illuminationlight transmitted by the first light transmission area, along the samepropagation path of the converted light, to the second lighttransmission area or the second color filter area to be transmitted orfiltered.

In some embodiments, the system further includes: an illumination lightsource generating an illumination light, and a second optical assemblywhich combines the illumination light and the converted light filteredby the first color filter area into one beam of light.

In some embodiments, the wavelength conversion device is a cylindricalstructure and the color filter device is a ring structure which iscoaxial fixed with the cylindrical structure so that they rotatecoaxially and synchronously under the driving of the driving device.

In some embodiments, the wavelength conversion area is provided on anouter surface of a sidewall of the cylindrical structure and reflectsthe converted light, and the first color filter area is provided on thering structure located outside of the cylindrical structure to receivethe converted light.

In some embodiments, the wavelength conversion device and the colorfilter device are two cylindrical structures coaxially fixed and nestedwithin each other to rotate coaxially and synchronously under thedriving of the driving device; the wavelength conversion area and thefirst color filter area are respectively provided on sidewalls of thetwo cylindrical structure; and the converted light is transmitted by thewavelength conversion area and incident on the first color filter area.

In some embodiments, the wavelength conversion device and the colorfilter device are two strip structures adjoined side by side, on whichthe wavelength conversion area and the first color filter area areprovided side by side, the two strip structures move in an oscillatinglinear translational motion under the driving of the driving device.

The present invention also provides a source module, which includes:wavelength conversion device including at least one wavelengthconversion area, and a color filter device fixed with respected to thewavelength conversion device and including at least one color filter,where the wavelength conversion area and the color filter area movesynchronously under the driving of a driving device.

In some embodiments, the wavelength conversion device and the colorfilter device are two ring structures fixed coaxially.

In some embodiments, the wavelength conversion device is a cylindricalstructure and the color filter device is a ring structure which is fixedcoaxially with the cylindrical structure.

In some embodiments, the wavelength conversion area is provided on anouter surface of a sidewall of the cylindrical structure, and the colorfilter area is provided on the ring structure located outside of thecylindrical structure.

In some embodiments, the wavelength conversion device and the colorfilter device are two cylindrical structures which are fixed coaxiallyand nested within each other, and the wavelength conversion area and thecolor filter area are provided on sidewalls of the two cylindricalstructures respectively.

In some embodiments, the wavelength conversion device and the colorfilter device are two strip structures adjoined side by side, on whichthe wavelength conversion area and the color filter area are providedside by side.

The present invention also provides a projection system, which includesa light source system described above.

The advantage of the present invention is: different from the prior art,in the projection system, the light source system and the light sourceassembly of the present invention, the color filter device and thewavelength conversion device are fixed with each other, and driven bythe same driving device, which can bring the advantages: the structureis simple, it is easy to implement, and the synchronization effect isexcellent.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates the structure of a light source system according to afirst embodiment of the present invention.

FIG. 2 is a front view of the wavelength conversion device and the colorfilter device of the light source system shown in FIG. 1.

FIG. 3 illustrates the structure of a light source system according to asecond embodiment of the present invention.

FIG. 4 is a front view of the wavelength conversion device and the colorfilter device of the light source system shown in FIG. 3.

FIG. 5 illustrates the structure of a light source system according to athird embodiment of the present invention.

FIG. 6 is a front view of the wavelength conversion device and the colorfilter device of the light source system shown in FIG. 5.

FIG. 7 illustrates the structure of a light source system according to afourth embodiment of the present invention.

FIG. 8 illustrates the structure of a light source system according to afifth embodiment of the present invention.

FIG. 9 illustrates the structure of a light source system according to asixth embodiment of the present invention.

FIG. 10 illustrates the structure of a light source system according toa seventh embodiment of the present invention.

FIG. 11 illustrates the structure of a light source system according toan eighth embodiment of the present invention.

FIG. 12 illustrates the structure of a light source system according toa ninth embodiment of the present invention.

FIG. 13 illustrates the structure of a light source system according toa tenth embodiment of the present invention.

FIG. 14 illustrates the structure of a light source system according toan eleventh embodiment of the present invention.

FIG. 15 illustrates the structure of a light source system according toa twelfth embodiment of the present invention.

FIG. 16 is a front view of the wavelength conversion device and thecolor filter device of the light source system shown in FIG. 15.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIG. 1 and FIG. 2, FIG. 1 illustrates the structure of alight source system according to a first embodiment of the presentinvention, and FIG. 2 is a front view of the wavelength conversiondevice and the color filter device in the light source system shown inFIG. 1. As show in FIG. 1, the light source system in this embodimentmainly includes an excitation light source 101, a dichroic mirror 102, amirror 104, lenses 103 and 105, a wavelength conversion device 106, acolor filter device 107, a driving device 108 and a light homogenizationdevice 109.

The excitation light source 101 is for generating an excitation light.In this embodiment, the excitation light source 101 is ultraviolet ornear-ultraviolet laser diode or ultraviolet or near-ultraviolet lightemitting diode, in order to generate ultraviolet or near-ultravioletexcitation light.

As show in FIG. 2, the wavelength conversion device 106 has a ringstructure, including at least one wavelength conversion area. In thepresent embodiment, the wavelength conversion device 106 includes a redwavelength conversion area, a green wavelength conversion area, a bluewavelength conversion area and a yellow wavelength conversion area,which are provided in circumferential subsections of the ring structure.Different wavelength conversion materials are coated on the wavelengthconversion areas respectively (for example, phosphor materials ornanomaterials). The wavelength conversion materials can convert theultraviolet or near-ultraviolet excitation light that illuminate theminto the converted light of corresponding color. Specifically, the redwavelength conversion area converts the ultraviolet or near-ultravioletexcitation light incident to it into red converted light, the greenwavelength conversion area converts the ultraviolet or near-ultravioletexcitation light incident to it into green converted light, the bluewavelength conversion area converts the ultraviolet or near-ultravioletexcitation light incident to it into blue converted light, and theyellow wavelength conversion area converts the ultraviolet ornear-ultraviolet excitation light incident to it into yellow convertedlight. In the present embodiment, a reflective substrate is providedunder the wavelength conversion materials in order to reflect theconverted light generated by the wavelength conversion materials, sothat the exit direction of the converted light output from thewavelength conversion area is opposite to the incident direction of theexcitation light incident to the wavelength conversion area.

As show in FIG. 2, the color filter device 107 has a ring structure,coaxially fixed with the wavelength conversion device 106, and disposedoutside the ring of the wavelength conversion device 106. In otherembodiments, the color filter device 107 can also be disposed inside thering of the wavelength conversion device 106. The color filter device107 includes at least one color filter area. In the present embodiment,the color filter device 107 includes a red filter area, a green filterarea, a blue filter area and a yellow filter area, which are provided incircumferential subsections of the ring structure. Each color filterarea corresponds to a wavelength conversion area of the wavelengthconversion device 106. In the present embodiment, the color filter areaand the wavelength conversion area of the same color are set at a180-degree angle from each other with respect to the center of the ringstructures of the wavelength conversion device 106 and the color filterdevice 107. The different color filter areas have different spectralresponses, and filter the converted light of corresponding colors, inorder to improve the color purity of the converted lights.

Of course, the color filter area and the wavelength conversion area ofthe same color can be set at angles with respect to the center of thering structures of the wavelength conversion device 106 and the colorfilter device 107.

As show in FIG. 1, the driving device 108 is a rotary device which has arotary shaft 1081, for example, a rotary motor. The wavelengthconversion device 106 and the color filter device 107 are coaxiallyfixed on the rotary shaft 1081, and rotate synchronously under thedriving of the rotary shaft 1081.

In the working process of the light source system 100 shown in FIG. 1,the ultraviolet or near-ultraviolet excitation light generated by theexcitation light source 101 is transmitted through the dichroic mirror102, converged by the lens 103, incident on the wavelength conversiondevice 106, to form a light spot 101A on the wavelength conversiondevice 106 as shown in FIG. 2. The wavelength conversion device 106 andthe color filter device 107 rotate synchronously under the driving ofthe driving device 108, so that the wavelength conversion areas of thewavelength conversion device 106 and the color filter areas of the colorfilter device 107 can rotate synchronously. When the wavelengthconversion device 106 and the color filter device 107 rotate, thewavelength conversion areas of the wavelength conversion device 106 aredisposed in the propagation path of the ultraviolet or near-ultravioletexcitation light generated by the excitation light source 101sequentially and periodically, so that the ultraviolet ornear-ultraviolet excitation light can be converted into the convertedlight of different colors sequentially by the respective wavelengthconversion areas. The converted lights of different colors are furtherreflected by the wavelength conversion areas respectively, guided by thefirst optical assembly which is composed of lenses 103 and 105, dichroicmirror 102, and reflecting mirror 104, then incident on the light filerdevice 107 and form a light spot 101B as shown in FIG. 2.

In the first optical assembly, the lenses 103 and 105 are used forcollecting and condensing the converted light respectively, so that thedivergence angle of the converted light can be decreased. The dichroicmirror 102 and the reflecting mirror 104 are used for reflecting theconverted light, so that the propagation direction of the convertedlight can be changed. In the present embodiment, the dichroic mirror 102and the reflecting mirror 104 are set at a 90-degree angle to each otherand 45-degree angle to the incident direction of the converted light. Inthe present embodiment, because of the reflection of the dichroic mirror102 and the reflecting mirror 104, the propagation direction of theconverted light is shifted by a predetermined distance and inverted by180-degree angle, and the light spot 101A is set at 180-degree angle tothe light spot 101B with respect to the center of the ring structures ofthe wavelength conversion device 106 and the color filter device 107.

In this case, the wavelength conversion device 106 is fixed with respectto the color filter device 107, and the wavelength conversion areas ofthe wavelength conversion device 106 and the color filter areas of thecolor filter device 107 with the same colors are set at 180-degree anglefrom each other with respect to the center of the ring structures of thewavelength conversion device 106 and the color filter device 107 androtate synchronously, so that the converted light of different colorsgenerated by the wavelength conversion areas of the wavelengthconversion device 106 are incident on the color filter areas of thecolor filter device 107 with the same colors after they pass through thedichroic mirror 102 and the reflecting mirror 104, and the color purityis improved by the color filter area with the same color filtering thelight. After filtering by the color filter area of the color filterdevice 107, the converted light then is incident on the lighthomogenization device 109 to be made uniform.

In the light source system 100 of the present embodiment, the wavelengthconversion device 106 and the color filter device 107 are fixed withrespect to each other and driven synchronously by the same drivingdevice. At the same time, the wavelength conversion area and the colorfilter area of the same color are synchronized by the first opticalassembly. It has the advantages that: the structure is simple, it iseasy to implement and the synchronization effect is excellent. Inaddition, each element of the first optical assembly is stationary withrespect to the excitation light source, and do not rotate with therotation of the wavelength conversion device 106 and the color filterdevice 107, so the optical stability is improved.

Further, since the converted light generated through wavelengthconversion generally has an approximately Lambertian distribution, ifthe converted light is directly incident on the color filter area, theincident angle will be distributed in the range of 0 degree to 90degrees. However, the transmittance of the color filter area will shiftwith the increase of the incident angle, so in the present embodiment,the first optical assembly further includes a light convergence device(for example, a lens 105) to converge the converted light, which candecrease the incident angle of the converted light incidence on thecolor filter area and further improve the color filter effect. In apreferred embodiment, by adjusting the first optical assembly, theenergy of the converted light that is incident on the light filter 107with incident angles less than or equal to 60 degrees can be more than90% of the total energy of the converted light. In the presentembodiment, the dichroic mirror 102 and the reflecting mirror 104 can bereplaced by other forms of planar reflecting device, and the lenses 103and 105 can be replaced by other forms of optical devices. For example,the lens 105 may be replaced by various forms of light convergencedevices like a solid or hollow tapered light guide, a lens or lensgroup, a hollow or solid composite light condenser, or a curvedreflecting mirror, etc.

In addition, in the present embodiment, the wavelength conversion areasof the wavelength conversion device 106 can be a combination of one ormore of the red wavelength conversion area, the green wavelengthconversion area, the blue wavelength conversion area and the yellowwavelength conversion area, and the excitation light source can beanother suitable light source. Alternatively, those skilled in the artcan select the wavelength conversion area and the excitation lightsource with other colors as desired. In this case, the color filterareas of the color filter device 107 are configured according to thecolors of the converted light generated by the wavelength conversionareas of the wavelength conversion device 106, and the present inventionshall not be limited to any specific arrangement.

Referring to in FIG. 3 and FIG. 4, FIG. 3 is a schematic structural viewof the second embodiment of the light source system of the presentinvention, and FIG. 4 is a front view of the wavelength conversiondevice and the color filter device of the light source system shown inFIG. 3. The light source system 200 of the present embodiment and thelight source system 100 as shown in FIG. 1 and FIG. 2 differ in that:the excitation light source 201 is a blue laser or blue light-emittingdiode in order to generate a blue excitation light. As show in FIG. 4,in the present embodiment, besides of a red wavelength conversion area,a yellow wavelength conversion area and a green wavelength conversionarea, the wavelength conversion device 206 further includes a blue lighttransmission area. The color filter device 207 includes a red colorfilter area, a yellow color filter area and a green color filter area.In the present embodiment, the area of the color filter device 207 whichis corresponding to the blue light transmission area of the wavelengthconversion device 206 is not required to have a particular opticalproperty, and it can be provided as a counterweight balance area forrotation balance, so it should have the same or similar weight as theother color filter areas. In the present embodiment, the wavelengthconversion device 206 and the color filter device 207 rotatesynchronously under the driving of the driving device 208, so that thewavelength conversion areas and the blue light transmission area of thewavelength conversion device 206 are sequentially and periodicallydisposed in the propagation path of the blue excitation light generatedby the excitation light source 201. The wavelength conversion areasconvert the blue excitation light incident on them into the convertedlight of corresponding colors and reflect them, and the blue lighttransmission area transmits the blue excitation light incident on it.The blue light transmission area can be provided with appropriatescattering materials to destroy the collimation of the blue excitationlight. The converted light reflected by the wavelength conversion device206 is guided by the first optical assembly comprised of lenses 203 and205, dichroic mirror 202 and reflecting mirror 204 and incident on thecolor filter area of corresponding color on the color filter device 207,so that it is filtered by the color filter area to improve its colorpurity. The blue excitation light transmitted by the wavelengthconversion device 206 is guided by the second optical assembly comprisedof lenses 210 and 213, reflecting mirror 211 and dichroic mirror 212,and is combined with the converted light filtered by the color filterdevice 207 into one light beam, which is incident on the lighthomogenization device 209 to be made uniform.

Of the second optical assembly, the lenses 210 and 213 are used forcollecting and converging the blue excitation light transmitted by thewavelength conversion device 206, and the reflecting mirror 211 and thedichroic mirror 212 are used to reflect the blue excitation lighttransmitted by the wavelength conversion device 206 to change itspropagation path. In the present embodiment, the reflecting mirror 211and the dichroic mirror 212 are arranged in parallel with each other andthey are set at 45 degrees to the incident direction of the blueexcitation light so that the propagation direction of the blueexcitation light is shifted by a predetermined distance but itspropagation direction remains the same.

In the present embodiment, the blue excitation light generated by theexcitation light source 201 is directly outputted as the blue lightthrough transmission. In the present embodiment, the reflecting mirror211 and the dichroic mirror 212 can be replaced by other forms of planarreflecting devices, and the lenses 210 and 213 can be replaced by otherforms of optical devices. In addition, the above-described structure isalso applicable to the light source system in which excitation lightsources of other colors are used.

Referring to FIG. 5 and FIG. 6, FIG. 5 is a schematic structural view ofthe light source system according to the third embodiment of the presentinvention, FIG. 6 is a front view of the wavelength conversion deviceand the color filter device of the light source system shown in FIG. 5.The light source system 300 of the present embodiment and the lightsource system 200 shown in FIG. 3 and FIG. 4 differ in that: the lightsource 300 further includes. in addition to the excitation light source301, a red illumination light source 315 (for example, a red laser or ared light emitting diode) in order to generate a red illumination light.The red illumination light source 315 and the excitation light source301 are respectively provided on the opposite sides of the wavelengthconversion device 306 and the color filter device 307. The redillumination light generated by the red illumination light source 315passes through the lens 314, the dichroic mirror 311, the lens 310 to beincident on the wavelength conversion device 306; its incident directionis opposite to that of the excitation light generated by the excitationlight source 301.

In the present embodiment, the wavelength conversion device 306 includesa red light transmission area, a yellow wavelength conversion area, agreen wavelength conversion area and a blue light transmission area. Thecolor filter device 307 includes a red light transmission area, a yellowcolor filter area, a green color filter area and a counterweight balancearea. In the present embodiment, under the driving of the driving device308, the wavelength conversion device 306 and the color filter device307 rotate synchronously, so that the wavelength conversion areas, thered light transmission area and the blue light transmission area of thewavelength conversion device 306 are disposed in the propagation path ofthe blue excitation light generated by the excitation light source 301and the red illumination light generated by the red illumination lightsource 315 sequentially and periodically. The various wavelengthconversion areas convert the blue excitation light incident on them intothe converted light of corresponding color and reflect it, the bluelight transmission area transmits the blue excitation light incident onit, and the red light transmission area transmits the red illuminationlight incident on it. The blue light transmission area and the red lighttransmission area can be provided with appropriate scattering materialsto destroy the collimation of the blue excitation light and the redillumination light. The converted light reflected by the wavelengthconversion device 306 is guided by the first optical assembly comprisedof lenses 303 and 305, dichroic mirror 302 and reflecting mirror 304 andincident on the color filter area of corresponding color on the colorfilter device 307, so that it is filtered by the color filter area toimprove its color purity. The red illumination light transmitted by thewavelength conversion device 306 is guided by the first optical assemblycomprised of lens 303 and 305, dichroic mirror 302 and reflecting mirror304 and incident to the red light transmission area of the color filterdevice 307 along the same propagation path of the converted light, thentransmitted by the red light transmission area. The blue excitationlight transmitted by the wavelength conversion device 306 is guided bythe second optical assembly comprised of lenses 310 and 313, dichroicmirrors 311 and 312, and combined with the converted light filtered bythe color filter device 307 and the red illumination light transmittedby the color filter device 307 into one light beam, which is incident onthe light homogenization device 309 to be made uniform.

In a preferred embodiment, in order to ensure that the lighthomogenization device 309 receives only one color light at any time, therotation position of the wavelength conversion device 306 is detected,and a synchronization signal is generated based on the detection. Theexcitation light source 301 and the red illumination light source 315are turned on and off in a time-division manner according to thesynchronization signal. Specifically, the red illumination light source315 is turned on only when the red light transmission area is in thepropagation path of the red illumination light generated by the redillumination light source 315, and is turned off when the yellowwavelength conversion area, the green wavelength conversion area and theblue light transmission area are in the propagation path of the redillumination light. The excitation light source 301 is turned on onlywhen the yellow wavelength conversion area, the green wavelengthconversion area and the blue light transmission area are in thepropagation path of the blue excitation light generated by the blueexcitation light source, and is turned off when the red lighttransmission area is in the propagation path of the blue excitationlight. In addition, in another preferred embodiment, a dichroic filterwhich transmits the red illumination light and reflects the blueexcitation light can be provided in the red light transmission area, areflecting mirror which reflects the red illumination light can beprovided for the yellow wavelength conversion area and the greenwavelength conversion area on the side facing the red illumination lightsource 315, and a dichroic filter that transmits the blue excitationlight and reflects the red illumination light can be provided in theblue light transmission area.

In the present embodiment, the red light outputted from the light sourcesystem 300 is supplied directly by the red illumination light source315, which can avoid the problem of low conversion efficiency of the redwavelength conversion material. Of course, when it needs to improve thecolor purity, the red light transmission area can be replaced by a redcolor filter area. In the present embodiment, those skilled in the artcan use other illumination light source to generate the illuminationlight of other colors.

Referring to FIG. 7, FIG. 7 is a schematic structural view of the lightsource system according to the fourth embodiment of the presentinvention. The light source system 400 of the present embodiment and thelight source system 300 shown in FIG. 5 and FIG. 6 differ in that: theexcitation light source 401 of the present embodiment is an ultravioletor blue excitation light source. At the same time, the wavelengthconversion device 406 in the present embodiment is provided with ayellow wavelength conversion area, a green wavelength conversion areaand a red light transmission area. So the excitation light source 401 isonly used to excite the yellow wavelength conversion area and the greenwavelength conversion area to generate yellow converted light and greenconverted light. The light source system 400 in the present embodimentfurther includes a blue illumination light source 416 in addition to theexcitation light source 401 and the red illumination light source 415.The blue illumination light generated by the blue illumination lightsource 416 passes through the second optical assembly comprised oflenses 417 and 418 and dichroic mirror 419, is combined with theconverted light filtered by the color filter device 407 and the redillumination light transmitted or filtered by the color filter device407 into one light beam, which is incident on the light homogenizationdevice 409 to be made uniform. In the present embodiment, the excitationlight source 401, the red illumination light source 415 and the blueillumination light source 416 can also be turned on and off in atime-division manner similar to the third embodiment.

In the present embodiment, the red light outputted from the light sourcesystem 400 is supplied directly by the red illumination light source 415and the blue light outputted from the light source system 400 issupplied directly by the blue illumination light source 416, which canavoid the problem of low conversion efficiency of the wavelengthconversion materials, and is more suitable for the display field.

Referring to FIG. 8, FIG. 8 is a schematic structural view of the lightsource system according to the fifth embodiment of the presentinvention. The light source system 500 of the present embodiment and thelight source system 100 shown in FIG. 1 and FIG. 2 differ in that: thewavelength conversion device 506 converts the excitation light generatedby the excitation light source 501 into the converted light andtransmits it. The converted light transmitted by the wavelengthconversion device 506 is guided by the first optical assembly comprisedof lenses 503 and 505 and reflecting mirror 502 and 504 and incident onthe color filter area of the same color on the color filter device 507.After filtering by the color filter area it is incident on the lighthomogenization device 509.

In addition, the excitation light source 501 can also be a blue lightsource. A light transmission area can be further provided on thewavelength conversion device 506. The light transmission area isprovided in the propagation path of the excitation light generated bythe excitation light source 501 periodically and transmits it. Afterbeing transmitted by the light transmission area, the excitation lightpasses through the first optical assembly comprised of lenses 503 and505 and reflecting mirror 502 and 504, and is guided to another lighttransmission area or color filter area on the color filter device 507along the same propagation path as the converted light, to be istransmitted or filtered.

Referring to FIG. 9, FIG. 9 is a schematic structural view of the lightsource system according to the sixth embodiment of the presentinvention. The light source system 600 of the present embodiment and thelight source system 500 shown in FIG. 8 differ in that: the light sourcesystem 600 of the present embodiment further includes, in addition tothe excitation light source 601, a red illumination light source 615 inorder to generate a red illumination light. The red illumination lightsource 615 and the excitation light source 601 are provided on the sameside of the wavelength conversion device 606 and the color filter device607. The red illumination light generated by the red light illuminationlight source 615 is reflected by the dichroic mirror 613, converged bythe lens 611, then incident on the wavelength conversion device 606along the same direction as the excitation light generated by theexcitation light source 601. The excitation light generated by theexcitation light source 601 is converted into the converted light by thewavelength conversion area of the wavelength conversion device 606, andis transmitted by the wavelength conversion device 606. The redillumination light generated by the red illumination light source 615 istransmitted directly by the red light transmission area of thewavelength conversion device 606. The converted light transmitted by thewavelength conversion device 606 and the red illumination light isguided by the first optical assembly comprised of reflecting mirror 602and 604 and lenses 603 and 605, and incident on the color filter areaand the red light transmission area of the color filter device 607. Theconverted light filtered by the color filter area and the redillumination light transmitted by the red light transmission area arefurther incident on the light homogenization device 609. In addition,the red light transmission area can be replaced by a red color filterarea. In addition, the excitation light source 601 and the redillumination light source 615 in the present embodiment can also beturned on and off in a time-division manner similar to the thirdembodiment.

Referring to FIG. 10, FIG. 10 is a schematic structural view of thelight source system according to the seventh embodiment of the presentinvention. The light source system 700 of the present embodiment and thelight source system 600 shown in FIG. 9 differ in that: the light sourcesystem 700 of the present embodiment further includes a blueillumination light source 716 in addition to the excitation light source701 and the red illumination light source 715. The blue illuminationlight generated by the blue illumination light source 716 passes throughthe second optical assembly comprised of lens 717 and dichroic mirror718, and is combined with the converted light filtered by the colorfilter device 707 and the red illumination light filtered or transmittedby the color filter device 707 into one light beam, which is incident onthe light homogenization device 709 to be made uniform. In the presentembodiment, the excitation light source 701, the red illumination lightsource 715 and the blue illumination light source 716 can be turned onand off in a time-division manner similar to the third embodiment.

Referring to FIG. 11, FIG. 11 is a schematic structural view of thelight source system according to the eighth embodiment of the presentinvention. The light source system 800 of the present embodiment and thelight source system 100 shown in FIG. 1 and FIG. 2 differ in that: inthe present embodiment the excitation light generated by the excitationlight source 801 is converged by the fly eye lenses 803 and 804 andconverging lens 805, then incident on the wavelength conversion device806 through the light entrance port on the reflecting device 802. Theconverted light reflected by the wavelength conversion device 806 isthen reflected by the reflecting device 802 and incident on the colorfilter device 807. The reflecting device 802 is semi-ellipsoidal orhemispherical and its reflecting surface faces inside. The convertedlight filtered by the color filter device 807 is further incident to thetapered light guide rod 809. When the reflecting device 802 issemi-ellipsoidal, the converted light from the vicinity of one focuspoint of the reflecting device 802 can be reflected to the vicinity ofthe other focus point; when the reflecting device 802 is hemispherical,if two points are located near the center of the sphere and symmetricalwith respect to the center of the sphere, then the reflecting device 802can approximately reflect the converted light from one symmetrical pointto the other. In addition, in other embodiments, the reflecting device802 can be provided without a light entrance port, and the excitationlight source 801 and the reflecting device 802 are provided on theopposite sides of the wavelength conversion device 806. The excitationlight generated by the excitation light source 801 is incident on thewavelength conversion device 806 and the converted light is thentransmitted through the wavelength conversion device to the reflectingdevice 802.

It's worth noting that, under the reflection of the reflecting device802, the light spot formed by the excitation light generated by theexcitation light source 801 incident on the wavelength conversion device806 and the light spot formed by the converted light incident on thecolor filter device 807 are located at 0 degree from each other withrespect to the center of the ring structure of the wavelength conversiondevice 806 and the color filter device 807; thus, the wavelengthconversion area and color filter area of the same color on thewavelength conversion device 806 and color filter device 807 also needto be set at 0 degree from each other with respect to the center of thering structure of the wavelength conversion device 806 and the colorfilter device 807.

Of course, in other embodiments, through appropriate opticalarrangement, the light spot formed by the excitation light incident tothe wavelength conversion device 806 and the light spot formed by theconverted light incident to the color filter device 807 can be set atany angle from each other with respect to the center of the ringstructure of the wavelength conversion device 806 and the color filterdevice 807, so the wavelength conversion area and the color filter areaof the same color on the wavelength conversion device 806 and colorfilter device 807 can be set at any angle with respect to the center ofthe ring structure of the wavelength conversion device 806 and the colorfilter device 807.

Referring to FIG. 12, FIG. 12 is a schematic structural view of thelight source system according to the ninth embodiment of the presentinvention. The light source system 900 of the present embodiment and thelight source system 800 shown in FIG. 11 differ in that: the wavelengthconversion device 906 and the color filter device 907 are fixedcoaxially by the bracket 908, and are spaced apart along the axialdirection. A tapered light guide rod 909 is provided between thewavelength conversion device 906 and the color filter device 907. Theexcitation light generated by the excitation light source 901 isconverged by the fly eye lens 903 and 904 and the converging lens 905,then incident on the wavelength conversion device 906 through the lightentrance port on the reflecting device 902. The converted lightreflected by the wavelength conversion device 906 is incident on thereflecting device 902 and reflected. The converted light reflected bythe reflecting device 902 is first incident to the light guide rod 909.The light guide rod 909 collects the converted light in order to reducethe divergence angle of the converted light. After guided by the lightguide rod 909, the converted light is incident on the color filterdevice 907, so that the incident angle on the color filter device 907 issmaller, and the filtering effect is improved. In the presentembodiment, the light guide rod 909 can also be replaced by otheroptical device that is able to achieve the functions described above.Further, in the present embodiment, if the wavelength conversion device906 is a transmission type, the reflecting device 902 can be omitted,and then the converted light is transmitted by the wavelength conversiondevice 906 and incident on the light guide rod 909 directly.

As described above, in the embodiment shown in FIG. 11 and FIG. 12, anillumination light source can be further provided in addition to theexcitation light sources 801 and 901, such as a red illumination lightsource or a blue illumination light source.

Referring to FIG. 13, FIG. 13 is a schematic structural view of thelight source system according to the tenth embodiment of the presentinvention. The light source system 1000 of the present embodiment andthe light source system 100 shown in FIG. 1 and FIG. 2 differ in that:the wavelength conversion device 1006 of the present embodiment is acylindrical structure, and the wavelength conversion areas are providedon the outside surface of the sidewall of the cylindrical structure. Thecolor filter device 1007 has a ring structure. The wavelength conversiondevice 1006 and the color filter device 1007 are further coaxially fixedon the rotating shaft of the driving device 1008, and rotate coaxiallyand synchronously under the driving of the driving device 1008.

In the working process of the light source system 1000 according to thepresent embodiment, the excitation light generated by the excitationlight source 1001 is transmitted by the dichroic mirror 1002, convergedby the lens 1003, then incident on the outside surface of the sidewallof the wavelength conversion device 1006. The wavelength conversionareas on the outside surface of the sidewall of the wavelengthconversion device 1006 convert the excitation light into the convertedlight and reflect it. After reflected by the wavelength conversiondevice 1006, the converted light is guided by the first optical assemblywhich is comprised of lens 1003 and 1004 and the dichroic mirror 1002,and incident on the color filter device 1007. The color filter areas onthe color filter device 1007 are provided outside of the cylindricalstructure of the wavelength conversion device 1006, so that theconverted light can be incident on them and filtered to improve thecolor purity. After filtered by the color filter areas of the colorfilter device 1007, the converted light is further incident on the lighthomogenization device 1009 to be made uniform. In other embodiments, thewavelength conversion device 1006 can also transmit the converted lightto the color filter device 1007.

Referring to FIG. 14, FIG. 14 is a schematic structural view of thelight source system according to the eleventh embodiment of the presentinvention. The light source system 1100 of the present embodiment andthe light source system 100 shown in FIG. 1 and FIG. 2 differ in that:in the present embodiment the wavelength conversion device 1106 and thecolor filter device 1107 are two cylindrical structures which are fixedcoaxially and nested within each other, and the wavelength conversionareas and the first color filter areas are provided on the sidewalls ofthe two cylindrical structures respectively. The color filter device1107 is located outside of the wavelength conversion device 1106. Thewavelength conversion device 1106 and the color filter device 1107 arefurther coaxially fixed on the rotating shaft of the driving device1108, and rotate coaxially and synchronously under the driving of thedriving device 1108.

In the working process of the light source system 1100 according to thepresent embodiment, the excitation light generated by the excitationlight source 1101 is reflected by the reflecting mirror 1102, convergedby the lens 1103, then incident on the wavelength conversion device1106. The wavelength conversion areas of the wavelength conversiondevice 1106 convert the excitation light into the converted light andtransmit it. After being transmitted by the wavelength conversion device1106, the converted light is guided by the first optical assemblycomprised of lens 1104 and incident on the color filter device 1107. Thecolor filter areas of the color filter device 1107 filter the convertedlight to improve its color purity. After filtering by the color filterareas of the color filter device 1107, the converted light is furtherincident on the light homogenization device 1109 to be made uniform.

Referring to in FIG. 15 and FIG. 16, FIG. 15 is a schematic structuralview of the light source system according to the twelfth embodiment ofthe present invention, and FIG. 16 is the front view of the wavelengthconversion device and the color filter device of the light source systemshown in FIG. 15. The light source system 1200 of the present embodimentand the light source system 200 shown in FIG. 3 and FIG. 4 differ inthat: in the present embodiment, the wavelength conversion device 1206and the color filter device 1207 are two strip structures adjoined sideby side, where the wavelength conversion areas and the first colorfilter areas are arranged side by side in the two strip structures. Inthe present embodiment, the wavelength conversion device 1206 includes ared wavelength conversion area, a green wavelength conversion area, ablue light transmission area and a yellow wavelength conversion areawhich are arranged side by side sequentially from top to bottom. Thecolor filter device 1207 includes a red color filter area, a green colorfilter area, a blank area and a yellow color filter area which arearranged side by side sequentially from top to bottom.

The wavelength conversion device 1206 and the color filter device 1207move in an oscillating linear translational motion under the driving ofa suitable driving device (e.g. a linear motor), so that the redwavelength conversion area, the green wavelength conversion area, theblue light transmission area and the yellow wavelength conversion areaof the wavelength conversion device 1206 are periodically provided inthe propagation path of the blue excitation light generated by theexcitation light source 1201. The wavelength conversion areas convertthe blue excitation light incident on them into converted light ofcorresponding colors and reflect them, and the blue light transmissionarea transmits the blue excitation light incident on it. The blue lighttransmission area can be provided with an appropriate scatteringmaterial to destroy the collimation of the blue excitation light. Theconverted light reflected by the wavelength conversion device 1206 isguided by the first optical assembly comprised of lenses 1203 and 1205,dichroic mirror 1202 and reflecting mirror 1204, then incident on thecolor filter area of corresponding color on the color filter device1207, so that it is filtered by the color filter area to improve itscolor purity. The blue excitation light transmitted by the wavelengthconversion device 1206 is guided by the second optical assemblycomprised of lens 1210 and 1213, reflecting mirror 1211 and dichroicmirror 1212, and combined with the converted light filtered by the colorfilter device 1207 into one beam of light, which is incident to thelight homogenization device 1209 to be made uniform. In the presentembodiment, the structure of the wavelength conversion device 1206 andthe color filter device 1207 can also be applied to the otherembodiments described above, which is not described.

The present invention further provides a light source assemblyconstituted by the wavelength conversion device and the color filterdevice which are described in the above embodiments.

In summary, in the light source system and the light source assembly ofthe present invention, the color filter device and the wavelengthconversion device are fixed with respect to each other, and they aredriven by a same driving device, which can bring the advantages that:the structure is simple, it is easy to implement, and thesynchronization effect is excellent.

The invention is not limited to the above described embodiments. Variousmodification and variations can be made in the light source device andsystem of the present invention based on the above descriptions. Thus,it is intended that the present invention cover modifications andvariations that come within the scope of the appended claims and theirequivalents, as well as the direct or indirect application of theembodiment in other related technical fields.

What is claimed is:
 1. A light source system, comprising: an excitationlight source for generating an excitation light; a wavelength conversiondevice including at least one wavelength conversion area; a color filterdevice fixed with respected to the wavelength conversion device andincluding at least one first color filter area; a driving device fordriving the wavelength conversion device and the color filter device,wherein the wavelength conversion area and the first color filter areamove synchronously, and wherein the wavelength conversion area isperiodically disposed in a propagation path of the excitation light toconvert the excitation light into a converted light; and a first opticalassembly for directing the converted light to the first color filterarea, wherein the first color filter area filters the converted light toincrease its color purity.
 2. The light source system of claim 1,wherein the wavelength conversion device and the color filter device aretwo ring structures fixed coaxially.
 3. The light source system of claim2, wherein the driving device is a rotation device with a rotatingshaft, and the two ring structures are coaxially fixed to the rotatingshaft.
 4. The light source system of claim 2, wherein the wavelengthconversion area and the first color filter area are located at180-degree angle from each other with respect to a center of the tworing structures, and wherein a light spot formed by the excitation lighton the wavelength conversion device and a light spot formed by theconverted light on the color filter device after being directed by thefirst optical assembly are located at 180-degree angle from each otherwith respect to the center of the two ring structures.
 5. The lightsource system of claim 2, wherein the wavelength conversion area and thefirst color filter area are located at 0-degree angle from each otherwith respect to a center of the two ring structures, and wherein a lightspot formed by the excitation light on the wavelength conversion deviceand a light spot formed by the converted light on the color filterdevice after being directed by the first optical assembly are located at0-degree angle from each other with respect to the center of the tworing structures.
 6. The light source system of claim 2, wherein thewavelength conversion device and the color filter device are spacedapart along an axial direction of the driving device, wherein the firstoptical assembly includes at least one light collecting device disposedbetween the wavelength conversion device and the color filter device,and wherein the light collecting device collects the converted light sothat an energy of the converted light incident on the color filterdevice with less than or equal to 60-degree incident angles is more than90% of a total energy of the converted light.
 7. The light source systemof claim 1, wherein the wavelength conversion area reflects theconverted light so that a direction of the converted light emitted fromthe wavelength conversion area is opposite to a direction of theexcitation light incident on the wavelength conversion area.
 8. Thelight source system of claim 1, wherein the wavelength conversion areatransmits the converted light so that a direction of the converted lightemitted from the wavelength conversion area is the same as a directionof the excitation light incident on the wavelength conversion area. 9.The light source system of claim 1, wherein the first optical assemblyincludes at least one light collecting device which collects theconverted light so that an energy of the converted light incident on thecolor filter device with less than or equal to 60-degree incident anglesis more than 90% of a total energy of the converted light.
 10. The lightsource system of claim 1, wherein the first optical assembly includes atleast one reflecting device which reflects the converted light to changea propagation direction of the converted light, and wherein thereflecting device is a planar reflecting device, or a semi-ellipsoidalor hemispherical reflecting device with a reflecting surface facinginside.
 11. The light source system of claim 10, wherein the planarreflecting device includes a dichroic mirror or a reflecting mirror. 12.The light source system of claim 10, wherein the semi-ellipsoidal orhemispherical reflecting device with the reflecting surface facinginside is provided with a light entrance port through which theexcitation light is incident on the wavelength conversion device. 13.The light source system of claim 1, wherein the wavelength conversiondevice further includes a first light transmission area which isperiodically disposed in the propagation path of the excitation lightunder the driving of the driving device and which transmits theexcitation light.
 14. The light source system of claim 13, furthercomprising a second optical assembly which combines the excitation lighttransmitted by the first light transmission area and the converted lightfiltered by the first color filter area.
 15. The light source system ofclaim 13, wherein the color filter device includes a second lighttransmission area or a second color filter area, and wherein the firstoptical assembly guides the excitation light transmitted by the firstlight transmission area, along the same propagation path of theconverted light, to the second light transmission area or the secondcolor filter area to be transmitted or filtered.
 16. The light sourcesystem of claim 1, further comprising an illumination light source whichgenerates an illumination light, wherein the wavelength conversiondevice further includes a first light transmission area which isperiodically disposed in a propagation path of the illumination lightunder the driving of the driving device, the first light transmissionarea transmitting the illumination light, wherein the color filterdevice further includes a second light transmission area or a secondcolor filter area, and wherein the first optical assembly guides theillumination light transmitted by the first light transmission area,along the same propagation path of the converted light, to the secondlight transmission area or the second color filter area to betransmitted or filtered.
 17. The light source system of claim 1, furthercomprising: a illumination light source generating a illumination light;and a second optical assembly which combines the illumination light andthe converted light filtered by the first color filter area into onebeam of light.
 18. The light source system of claim 1, wherein thewavelength conversion device is a cylindrical structure and the colorfilter device is a ring structure which is coaxial fixed with thecylindrical structure so that they rotate coaxially and synchronouslyunder the driving of the driving device.
 19. The light source system ofclaim 18, wherein the wavelength conversion area is provided on an outersurface of a sidewall of the cylindrical structure and reflects theconverted light, and wherein the first color filter area is provided onthe ring structure located outside of the cylindrical structure toreceive the converted light.
 20. The light source system of claim 1,wherein the wavelength conversion device and the color filter device aretwo cylindrical structures coaxially fixed and nested within each otherto rotate coaxially and synchronously under the driving of the drivingdevice, wherein the wavelength conversion area and the first colorfilter area are respectively provided on sidewalls of the twocylindrical structure, and wherein the converted light is transmitted bythe wavelength conversion area and incident on the first color filterarea.
 21. The light source system of claim 1, wherein the wavelengthconversion device and the color filter device are two strip structuresadjoined side by side, on which the wavelength conversion area and thefirst color filter area are provided side by side, and wherein the twostrip structures move in an oscillating linear translational motionunder the driving of the driving device.
 22. A projection system,comprising a light source system according to claim
 1. 23. A lightsource module, comprising: a wavelength conversion device including atleast one wavelength conversion area; and a color filter device fixedwith respected to the wavelength conversion device and including atleast one color filter, wherein the wavelength conversion area and thecolor filter area move synchronously under the driving of a drivingdevice.
 24. The light source module of claim 23, wherein the wavelengthconversion device and the color filter device are two ring structuresfixed coaxially.
 25. The light source module of claim 23, wherein thewavelength conversion device is a cylindrical structure and the colorfilter device is a ring structure which is fixed coaxially with thecylindrical structure.
 26. The light source module of claim 25, whereinthe wavelength conversion area is provided on an outer surface of asidewall of the cylindrical structure, and wherein the color filter areais provided on the ring structure located outside of the cylindricalstructure.
 27. The light source module of claim 23, wherein thewavelength conversion device and the color filter device are twocylindrical structures which are fixed coaxially and nested within eachother, and wherein the wavelength conversion area and the color filterarea are provided on sidewalls of the two cylindrical structuresrespectively.
 28. The light source module of claim 23, wherein thewavelength conversion device and the color filter device are two stripstructures adjoined side by side, on which the wavelength conversionarea and the color filter area are provided side by side.